JP2001523745A - Polymer blends based on polyolefin and polyamide resins - Google Patents

Abstract

  (57) [Summary] A polymer composition comprising a compatibilized blend of a polyolefin and a polyamide grafted with a copolymerized allyl epoxy compound and a styrene compound. The composition is obtained by grafting a polyolefin with an allyl epoxy compound and styrene in the presence of a peroxide in a one-step reactive extrusion process. This composition can be used in packaging for food and other products that require an improved oxygen barrier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

The present invention relates to compatibilized blends of polyolefin and polyamide resins, methods of making such blends, and uses thereof. More particularly, the present invention relates to a continuous one-step reactive extrusion process comprising simultaneously grafting an allyl epoxy monomer and a styrene monomer onto a polyolefin resin, and then blending it with a polyamide resin.

[0002]

[Prior art]

BACKGROUND OF THE INVENTION Polyolefins (PO), such as polyethylene (PE) and polypropylene (PP)
Is a very versatile resin used in many fields and is processed into sheets or films for packaging and other purposes. Polyolefins have very low water vapor permeability and high gas permeability. To reduce the latter, polyolefins are often used with polyamide (PA), for example, by laminating PO and PA film layers together. Attempts have also been made to blend polyolefins and polyamides to obtain compositions having both low water vapor permeability and gas permeability. However, polyolefins and polyamides are very incompatible, and in order to obtain a homogeneous blend thereof, a compatibilizer is needed,
Improves its miscibility by stabilizing the polymer-polymer interface. A commonly used compatibilizer is a separately synthesized copolymer, which is necessarily quite expensive. In addition, if different compatibilizers are used, some of them will be remote from the polymer-polymer interface, i.e., in coherent regions of the polymer composition,
There, compatibilizers are useless at all. Another procedure is to graft one or more of the resins to be blended with a suitable compatibilizing compound.

[0003]

[Problems to be solved by the invention]

All of the prior art methods for the production of compatibilized PO / PA blends are two-step processes: producing the compatibilizer separately, or adding a particular compound to one of the resins to be blended. Or a first step involving grafting to both, and a second step of blending the components.

[0004] EP 0,363,479 discloses a blend of polypropylene and polyamide prepared by a two-step process. In the first step, the polypropylene homopolymer (70%) and PA6 (30%), the added maleic anhydride (0.3%) and the peroxide (0.3%) are mixed at room temperature in a Henschel mixer. After mixing, in a second stage, the resulting blend is extruded at 220 ° C. in a twin screw extruder to give a masterbatch. Twenty parts of this master batch were mixed with 30 parts of PA6, 50 parts of PP homopolymer and 10 parts of styrene rubber (SEBS) (all parts based on weight) at room temperature using a Henschel mixer, and then using a twin screw extruder. Extrusion at 250 ° C. produces the final composition.

[0005] GB 1,403,797 discloses a composition made by grafting maleic anhydride onto polypropylene, mixing the resulting material with different amounts of polypropylene, and then mixing the resulting material with a polyamide. Disclose.

US Pat. No. 4,814,379 relates to a blend obtained by combining a polyamide with a mixture comprising maleic anhydride grafted high density polyethylene, linear low density polyethylene and EPDM rubber.

[0007] US Pat. No. 5,162,422 relates to a PP / PA composition produced by a two-step process. In a first stage, the polypropylene, unsaturated carboxylic acid and peroxide are mixed in a high-speed mixer, and in a second stage, the resulting mixture is extruded through a reaction zone on a twin-screw extruder. The polyamide and impact-mitigating rubber are extruded in separate extruders and the melt streams from the two extruders are combined.

[0008] International Patent Application Publication No. WO 96 / 06,871 (hereby incorporated by reference) discloses a compatibilization of polypropylene and polybutylene terephthalate obtained by using reactive extrusion. Disclosed blends. In the first section of the extruder, the polypropylene is melted and mixed with peroxide, glycidyl methacrylate and styrene compound to obtain a grafted polypropylene resin, and in the second section of the same extruder, polybutylene terephthalate is introduced. And melt blended with the already grafted polypropylene. A homogeneous blend is obtained, which is useful as an engineering resin.

[0009] There is still a need for a suitable process for producing improved polyolefin / polyamide blends having useful mechanical and physical properties. The applicant has now surprisingly been able to produce a homogeneous compatibilized blend of polyolefin and polyamide by an industrially applicable and cost-effective one-step reactive extrusion process. I found something.

[0010]

[Means for Solving the Problems]

SUMMARY OF THE INVENTION The present invention provides a compatibilized polymer blend comprising a polyolefin and a polyamide, wherein the polyolefin is copolymerized with an allyl epoxy compound and a styrene compound.

[0011] The present invention also provides a polyolefin to the first feed section of the extruder;

Embedded image Wherein R is H or C _1-4 alkyl; R ₁ is — (CH ₂ ) _n —, —C (O) O— (CH ₂ ) _n — or — (CH ₂ ) _n —O— And n is an integer of 1 to 4]; an allyl epoxy compound having the formula:

Embedded image Wherein R ₂ is H, OH, CH ₃ or allyl; and introducing a peroxide which is a free radical initiator, at a temperature above the melting point of the polyolefin resin and the decomposition temperature of the peroxide. Subjecting the components to continuous blending while heating the polyamide resin at a location along the extruder barrel where the polyolefin resin is in the molten state, downstream of a first feed section. In the feed section of the extruder by blending the polyamide resin with the molten polyolefin resin while heating until a homogeneous blend is achieved, and extruding the resulting blend. , A polyolefin resin and a polyamide resin by a continuous one-step extrusion process performed in an extruder. To provide a method for producing the blends compatibilized in-Sights (in situ) of.

[0012] The resulting polymer composition can be processed into a packaging material intended for packaging articles requiring a low water vapor transmission rate and low gas and flavor permeability. (Detailed description of the invention)

[0013] The compatibilized blend of the present invention comprising a polyolefin resin and a polyamide resin is obtained by an extrusion process performed under conditions substantially free of degradation of the polyolefin resin and the polyamide resin by chain scission.

[0014] In principle, all extrudable polyolefins are converted in situ.
) Can be used in the process of the invention for grafting and blending. Preferred polyolefins are those belonging to the group comprising polyethylene homopolymers and polypropylene homopolymers, random copolymers of propylene or ethylene and a comonomer, and block copolymers of propylene or ethylene and a comonomer. More preferably, a polypropylene homopolymer; a copolymer of propylene, preferably up to 20% by weight of ethylene; a copolymer of propylene, butadiene and optionally ethylene; a copolymer of propylene and another α-olefin; And high density polyethylene. Most preferably, the polyolefin resin is selected from the group comprising polypropylene and the low density polyethylene copolymer described above. The polyolefin resin can be used in granular or powder form, preferably as a free-flowing powder.

[0015] The polypropylene resin used in the present invention may comprise a single grade of polypropylene or a mixture of two or more of the above polypropylenes. Preferred polypropylenes have a molecular weight of 150,000-500,000 g / mol and a melt flow rate of 0.2-100 g / 10 min, more preferably 0.2-50 g / 10 min (according to ASTM D 1238 at 230 ° C. and 2.16 kg load). (Measured).

Preferred polyethylenes have a density of 0.880-0.950 g / cm ³ and a melt flow rate
It is a polyethylene having 0.5 to 50 g / 10 min, more preferably 1 to 30 g / 10 min (measured at 190 ° C. and 2.16 kg load according to ASTM D 1238).

[0017] All commercially available types of polyamides can be used. Examples of particularly useful polyamides are polycaprolactam (PA6), polyhexamethylene adipamide (PA66), polyhexamethyleneazaleamide (PA69), polyhexamethylene sebacamide (PA610), polyhexamethylene dodecanediamide (PA612), and polyhexamethylene dodecanediamide (PA612). (Ω-aminoundecanoic acid) (PA11). Other types of polyamides can also be used. A particularly preferred polyamide is polycaprolactam (PA6) having a suitable viscosity.

[0018] The monomeric allylic epoxy compound to be grafted to the polymer chain must contain polar or functional substituents. Such monomers are preferably of the formula:

Embedded image Wherein R is H or C _1-4 alkyl; R ₁ is — (CH ₂ ) _n —, —C (O) O— (CH ₂ ) _n — or — (CH ₂ ) _n —O— And n is an integer of from 1 to 4]. Preferably, R is H or CH _3, more preferably is CH _3. R ₁ is preferably —C (O) O— (CH ₂ ) _n —. Thus, the most preferred compound is glycidyl methacrylate (
GMA). Although each of these monomer species is suitably used alone, mixtures thereof can also be used.

The degree of conversion during the grafting reaction can be improved by using a suitable comonomer, for example a styrene compound. Suitable styrene compounds have the formula:

Embedded image (Where R ₂ is H, OH, CH ₃ or allyl). Preferably, R ₂ is H, making styrene a preferred styrene compound. Styrene compounds also appear to stabilize free radical species present during the blending process by delocalization. Compounds having a conjugated unsaturated double bond other than those described above, such as quinone, can give similar results.

The allyl epoxy compound and styrene compound are used in approximately equimolar amounts.
Based on the weight, the amount of each of the two types of grafting monomers ranges from 1 to 10% by weight, preferably 1 to 7% by weight, more preferably 1 to 5% by weight, based on the weight of the polypropylene resin. is there.

To initiate the grafting reaction, any peroxide compound that generates free radicals when heated to an appropriate decomposition temperature can be used. In particular, the following alkyl peroxide initiators have been found to give acceptable results: 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane (DHBP); 2,5-dimethyl- 2,5-bis (t-butylperoxy) -3-hexyne; α, α-bis- (t-butylperoxy) diisopropylbenzene and dicumyl peroxide (DCUP). These initiators
It is used in an amount of 0.10 to 5%, preferably 0.20 to 1%, more preferably 0.2 to 0.3%, most preferably about 0.25% by weight of the polypropylene resin.

The process of the present invention comprises an extruder, preferably of sufficient length, for example a length / diameter ratio (
L / D) is most suitably performed by using a twin screw extruder with 42 co-rotating intermeshing screws. The extruder comprises two feed hoppers, a first feed hopper is located at the main feed point of the extruder and a second feed hopper is located at a distance of about 0.4 L downstream of the first hopper. This allows the extruder barrel to be divided into two main sections, a first section between the two feeds and a second section between the second feed and the die. It is in. Each of the two feed hoppers is connected to a feed device from which the starting material is continuously fed at a controlled rate to the extruder.

The first hopper comprises a polyolefin resin, in a mixture with a styrene compound, and optionally also with an allyl epoxy compound and an initiator. Optionally, these components can be premixed before being transported to the first feed hopper.
In an embodiment of the present invention, the allyl epoxy monomer used is maleic anhydride (MAH) or glycidyl alkyl acrylate (GMA) and the styrene compound is styrene. It is convenient to first mix the MAH or GMA with the styrene, then dissolve the peroxide initiator in this mixture and then mix it with the polypropylene powder. Thus, in the first main extruder section, the polyolefin melt contains 1 to 10% by weight, preferably 2 to 5% by weight, of M based on the polyolefin resin alone.
Must have AH or GMA concentration and corresponding styrene concentration.

[0024] The second hopper, 0.4 L downstream of the first hopper, contains a polyamide resin, which is then introduced into an extruder.

During the extrusion process, in order to obtain an optimum mixing of the polypropylene resin and the polyamide resin, they must have, in their molten state, approximately equal melt viscosities at the actual processing temperatures. Generally, the actual melt processing temperatures for polypropylene are in the range of about 180 ° C or higher, and for polyamides are in the range of 220 ° C or higher. However, the processing temperature must not be so high that a substantial degree of decomposition of the polymer resin occurs. The temperature of the melt should therefore not exceed about 300 ° C.

One problem that can be encountered in the graft and blend processes of the present invention is that
Possible contamination of reagents with oxygen from ambient air. Thus, the extrusion process of the present invention is preferably performed in an inert atmosphere, for example, a nitrogen atmosphere that can be easily achieved by flushing the feed hopper with nitrogen.

[0027] The polymer chain breakage and thus the molecular weight of the blends of the present invention can be controlled by the use of the comonomer systems described herein. The styrene compound is considered to function as a chain transfer agent in the graft reaction. Compared to conventional grafting and blending processes that do not use chain transfer agents, the process of the present invention can be performed with less degradation of the polypropylene resin.

The styrene compound also functions as a comonomer and reacts with the allyl epoxy monomer, which results in a random copolymer. Thus, the side chains grafted on the polypropylene backbone are these two random copolymers. Simultaneous grafting of the two monomers provides a synergistic effect that results in higher grafting efficiency and a higher amount of monomer grafted on the polypropylene resin compared to other grafting processes. As a result, the number of polar groups in the final grafted polypropylene resin increases. The polar groups are believed to react with the functional groups of the polyamide at the interface between the polypropylene and polyamide fractions. Hence, there is a small amount of somewhat weak crosslinking between the polypropylene resin and the polyamide resin, with the allyl epoxy compound as the crosslinking species.

The final blend consists of a continuous matrix and a dispersed phase. In principle, one of the polypropylene resin and the polyamide resin can constitute the matrix, and the other resin can constitute the dispersed phase. However, in view of practical use, it is preferred that the polypropylene constitutes the matrix and has polyamide as the disperse phase. Thus, the blend obtained by the process of the present invention preferably comprises more than 50% by weight of polypropylene and less than 50% by weight of polyamide resin. When the composition comprises about equal amounts of polypropylene resin and polyamide resin,
That is, the weight ratio of polypropylene to polyamide is about 50:50 to about 60:40, respectively.
In some cases, problems due to phase inversion may be encountered, so that compositions in this range must be avoided. Thus, the blends obtained according to the present invention preferably contain less than about 40% by weight of the polyamide component, based on the total weight of the final composition. Blends having improved properties can include up to 30% by weight of the polyamide component, for example, 20% or 15% by weight of the polyamide component. Even compositions containing as little as 1% by weight of polyamide have improved useful properties.

All the usual additives used in thermoplastic processing, such as colorants, UV absorbers,
Heat stabilizers, antistatic agents and the like can also be added to the composition and are well known to those skilled in the art.

The compositions of the present invention can also be blended with any filler suitable for use with polyolefins and polyamides. Examples of such fillers are talc, mica and barium sulfate. Also, reinforcing fibers, especially glass fibers, can be incorporated. The purpose of using fillers or fibers is to improve modulus and resistance to thermal deformation. The use of such fillers or fibers is also well known to those skilled in the art.

Articles made from an in situ compatibilized blend of polypropylene (PP) and polyamide (PA) according to the present invention exhibit favorable properties from both the polypropylene and polyamide components of the composition. Granted. Compared to regular polypropylene materials, the compositions of the present invention have better oxygen barrier, improved printability, higher impact strength and higher modulus. The composition of the present invention comprises:
Particularly suitable for processing into extruded blown films and sheets or extruded cast films and sheets, and for injection molding.

Because of the favorable properties, the compositions of the present invention can be used in packaging intended for the packaging of products that require low water vapor transmission rates and low gas and flavor permeability. Thus, the compositions of the present invention provide high levels of medium barrier for gases, such as oxygen, and for flavor components, such as hydrocarbons.
It is well suited for use in food packaging and industrial product packaging, which requires ier).

Although the previous discussion has been limited to specific polyolefins, the same principles also apply to the relevant polyolefins.

The word “comprising” and other forms of “comprising” as used in the description and claims of the present invention are used to indicate that the claimed invention will be obvious to those skilled in the art, and No limitation is intended to exclude any modifications or additions that do not materially affect the invention.

The invention will now be described with reference to the following examples, which should not be construed as limiting the scope of the invention. In the examples, all weights are
Unless otherwise stated, it is given in weight percent based on the combined weight of the polymer resins.

[0037]

EXAMPLES General Procedure The extruder used in the examples was a ZSK30 Werner & Pfleidere with a co-rotating meshing screw of length L = 1230 mm and L / D = 42.
r) It was a twin screw extruder. The extruder is equipped with two feed hoppers, the first feed hopper defining a first feed point, and at a distance downstream L ₁ = 0.378 L, the second feed hopper establishes a second feed point. Stipulates. The extruder temperature was set at about 200 ° C. in the area between the two feed hoppers and about 250 ° C. downstream of the second feed hopper. The temperature profile was adjusted to obtain a melt temperature of about 250 ° C. in the extruder die. Operating at a screw rotation speed of about 100 rpm, yielding about 5 kg / hour. The polymer melt was extruded as strands, which were cooled in a convenient manner in a water bath and pelletized continuously. A polyolefin resin mixed with styrene, maleic anhydride (MAH) or glycidyl methacrylate (GMA) and peroxide was sent to a first feed hopper and then introduced into the extruder at a first feed point. The polyamide resin was conveyed to a second feed hopper and introduced into the extruder at a second feed point.

Tests The resulting compositions were tested for the following essential properties: E-modulus was measured according to ISO 527 on the basis of a stress-strain curve recorded by a tensile test. Impact strength was measured as the total energy of failure by the dart spear method according to ISO 6603/1. A 3 mm thick molded disk, test temperatures of 23 ° C. and −20 ° C. were used, respectively. Oxygen permeability was measured on a 1 mm thick injection molded disk at 23 ° C. using a conventional “Oxtrans” apparatus. A sheet that is injection molded from the resulting polymer blend and has a water vapor transmission rate (WVTR)
Was measured at 23 ° C. according to the procedure of ASTM D 3985. The heat distortion temperature (HDT) was measured according to the procedure of ISO 75. The obtained values are shown in Tables 1-3.

Example 1 The general procedure described above was followed. The polyolefin used is a polypropylene (PP) block copolymer ("Borealis P 401H", commercially available from Borealis AS, Norway) and the PA6 low viscosity grade ("Ultrami
d B3 ", commercially available from BASF GmbH, Germany). The amounts of propylene and polyamide were 85% by weight of the combined amount of polymer resin, respectively.
Constituted 15% by weight. The peroxide used was tert-butyl peroxybenzoate, which was added in an amount of 0.25% by weight of the polymer resin. The allyl epoxy compound was glycidyl methacrylate (GMA) and was added in an amount of 3% by weight of the polymer resin. Styrene was introduced in an amount corresponding to a 1: 1 molar ratio of GMA: styrene.

Example 2 Example 1 was repeated except that the amount of polyamide was 20%.

Example 3 Example 1 was repeated except that maleic anhydride (MAH) was used in an amount of 2% by weight instead of GMA.

Example 4 Comparative Example The grades of polypropylene and polyamide of Example 1 were combined in the same amounts used in Example 1 (ie, 85% and 15% by weight, respectively) and grafted with maleic anhydride. Compatibilizer consisting of polypropylene (PP-g-MAH) (International Patent Application Publication WO 9
(Prepared according to the disclosure of 4/15981). This compatibilizer is also commercially available from Eastman Chemicals, USA under the trade name "Epolene E-43". The polypropylene, compatibilizer and polyamide were combined and fed to the extruder at a first feed point. Extrusion conditions were the same as in the previous example.

Example 5 Example 3 was repeated except that the amount of polyamide was 30%.

Example 6 Polyamide PA6 was of high viscosity grade (“Ultramide B4”, commercially available from BASF) and the allyl epoxy compound was maleic anhydride (MAH
), And Example 1 was repeated except that it was added in an amount of 2% by weight. Styrene was introduced in an amount corresponding to a 1: 1 molar ratio of MAH: styrene.

Example 7 Example 6 was repeated except that the amount of polyamide was increased to 20% by weight.

Example 8 Example 6 was repeated except that the amount of polyamide was increased to 30% by weight.

Example 9 Comparative Example The polypropylene copolymer used in Example 1 was mechanically blended with 20% by weight of the polyamide PA6 low viscosity grade used in Example 1. This mixture was then introduced into the extruder at a first feed point. Extrusion conditions were the same as in the previous example. No graft monomer or peroxide was present.

Example 10 Comparative Example The polypropylene grade used in Examples 1-9 was extruded alone under the extrusion conditions of the previous example. Table 1 shows the results obtained in Examples 1 to 10. The results show that the in situ method of the present invention can perform as well as a conventional, more expensive two-step route. MAH was observed to be a more efficient grafting monomer than GMA, as shown by the results obtained in Examples 2 and 3, shown in Table 1. Comparing the results obtained in Example 3 according to the present invention with the results obtained in Example 4 showing a conventional two-stage route, the one-stage process of the present invention shows that
It can be seen that the polymer composition has properties essentially equivalent to the corresponding composition produced by the step process. The results obtained also show that the compositions according to the invention have good impact strength. Elastic modulus and oxygen permeability are more dependent on the total content of polyamide and less on the compatibility of the components. The results obtained are:
This novel one-step technique is shown to provide efficient compatibilization starting with pure polymer, appropriate peroxides and grafted monomers.

[0049]

[Table 1]

Example 11 Polypropylene was prepared with a density of 0.922 g / cm ³ and a melt flow rate of 2.1 g / 10 min (1
Replaced with low density polyethylene (LDPE) (“Borealis LE 0422”, commercially available from Borealis AS, Norway) having 90 ° C / 2.16 kg) and replaced the polyamide with a very high viscosity grade PA6 (“Ultramide Example 6 was repeated except that B5 "(commercially available from BASF, Germany).

Example 12 Comparative Example The LDPE and PA grades and amounts in Example 11 were used. Compatibilizer consisting of MAH-grafted PP (PP-g-MAH) (Epolene E-43), Eastman Chemi, USA
(commercially available from Cals) was added in an amount of 7.5% by weight of the combined weight of the polymer resins. Both the LDPE and PA resin and the compatibilizer were introduced into the extruder at the first feed point. The extrusion conditions of the previous example were used.

Example 13 Comparative Example 12 was repeated except that the amount of PA was 7.5% by weight and the amount of compatibilizer was 2.5% by weight.

Example 14 Comparative Example The LDPE grade of Example 12 was extruded alone under the extrusion conditions of the previous example. Table 3 shows the results obtained in Examples 11 to 14. The results show that the composition of the present invention (Example 11) has an improved oxygen barrier, ie, has a reduced oxygen permeability, while the water vapor transmission rate is lower than that of pure low density polyethylene (Example 11). 14) is maintained at the preferred level.

[0054]

[Table 2]

Reinforcing Fibers The following Examples 15-18 demonstrate the effect of adding glass fibers to the composition of the present invention. Example 15 relates to a composition without reinforced glass fibers, while Examples 16 and 17 relate to a composition including glass fibers. Examples 15-17 are according to the invention, while Example 18 is a comparative example. The experimental details and the results obtained are shown in Table 3.

Example 15 The general procedure described above was followed. Melt flow rate 12 g / 10 min (230 ° C / 2.16 k
g) was introduced into the extruder at the first feed point ("Borealis HE 125E", commercially available from Borealis AS, Norway). The amount of PP homopolymer constituted 60% by weight. Polyamide PA66 grade (Ultr
amide A45 ", commercially available from BASF, Germany) was introduced into the extruder at a second feed point. The amount of PA66 constituted 40% by weight. The peroxide used was tertiary butyl peroxybenzoate in an amount of 2.5% by weight of the total polymer resin (as in the previous example). As compatibilizer, maleic anhydride (MAH) was added in an amount of 3% by weight. Styrene was introduced in an amount corresponding to a molar ratio of MAH to styrene of 1: 1. Extrusion conditions were the same as detailed above.

Example 16 Example 15 was repeated except that the polyamide was previously thoroughly mixed with short glass fibers having a length of 4.5 mm and sizing of aminosilane in an amount of 0.7% by weight. This mixture of polyamide and glass fibers was introduced into the extruder at a second feed point. The final product contained 40% by weight of PP, 40% by weight of PA66 and 20% by weight of glass fibers, where all percentages are based on the combined weight of polymer resin and glass fibers.

Example 17 Example 16 was repeated except that the amount of PP was 30% by weight, the amount of PA66 was 40% by weight, and the amount of glass was 30% by weight.

Example 18 Comparative Example 17 except that no allyl epoxy compound or styrene was added
Was repeated. The results obtained in Examples 15 to 18 shown in Table 3 below show the elastic modulus (E-modulus).
) And the heat deflection temperature (HDT / A) increased with increasing glass fiber content. In Example 18 where no grafting occurred, the resulting composition had inferior properties to the composition of Example 17. This clearly demonstrates that compatibilization is also obtained in the inventive composition reinforced with glass fibers and that compatibilization has a positive effect on the mechanical properties of the composition.

[0060]

[Table 3]

──────────────────────────────────────────────────続 き Continuation of front page (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE ), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, GM, KE, LS, MW, SD, SZ, UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, HR, HU, ID, IL, IS, JP, KE, KG, KP , KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZWF Term (reference) 4F070 AA12 AA46 AA54 AC32 AC40 AC44 AC56 AC63 FA03 FB06 FC05 4J002 BB071 BB101 BB141 BB201 BB211 BN031 BN051 CL012 DL006 FA046 FD016 GG02

Claims (15)

[Claims] 1. A compatibilized polymer blend comprising a polyolefin and a polyamide, wherein the polyolefin is copolymerized with an allyl epoxy compound and a styrene compound. 2. The weight ratio of the grafted polyolefin to the polyamide is 2.
2. The composition of claim 1, wherein the composition is in the range of 99: 1 to 50:50. 3. The weight ratio between the grafted polyolefin and the polyamide is 3.
2. The composition of claim 1, wherein the composition is in the range of 99: 1 to 60:40. 4. The composition according to claim 1, wherein the amount of the copolymer grafted on the polyolefin is in the range from 0.1 to 7% by weight, based on the polyolefin. 5. The composition according to claim 1, wherein the allyl epoxy compound is selected from the group comprising maleic anhydride and glycidyl methacrylate, and the styrene compound is styrene. 6. The composition according to claim 1, wherein the polyamide is PA6. 7. The composition according to claim 1, wherein the polyolefin is selected from the group comprising polypropylene and polyethylene. 8. The composition according to claim 1, wherein the polyolefin is polypropylene. 9. The method according to claim 1, further comprising a filler or a reinforcing fiber.
The composition according to Item. 10. A polyolefin resin having the formula: Wherein R is H or C _1-4 alkyl; R ₁ is — (CH ₂ ) _n —, —C (O) O— (CH ₂ ) _n — or — (CH ₂ ) _n —O— And n is an integer of 1 to 4]; an allyl epoxy compound having the formula: Wherein R ₂ is H, OH, CH ₃ or allyl; and introducing a peroxide, a free radical initiator, into the first feed section of the extruder, and these components While heating to a temperature above the melting point of the polyolefin resin and the decomposition temperature of the peroxide,
In a method of producing an in situ compatibilized blend of a polyolefin resin and a polyamide resin by a continuous one-step extrusion process performed in an extruder by subjecting the polyamide resin to a continuous blending, the polyamide resin is mixed with the polyolefin resin. At a location along the extruder barrel in the molten state, in a second feed section located downstream of the first feed section, it is introduced into the extruder barrel and heated until a homogeneous blend is achieved. While blending the polyamide resin with a molten polyolefin resin and extruding the resulting blend. 11. The method according to claim 10, wherein the polyolefin is fed to the extruder in the form of a powder premixed with an allyl epoxy compound, a styrene compound and a peroxide. 12. The method according to claim 10, wherein the allyl epoxy compound is selected from the group comprising maleic anhydride or glycidyl methacrylate. 13. The method according to claim 10, wherein the styrene compound is styrene. 14. The peroxide initiator is bis- (t-butylperoxyisopropyl) benzene, and the concentration of the peroxide in the polyolefin melt mixture in the first extruder section is 0.2% based on the polyolefin polymer. ~ 0.3
14. The method according to any one of claims 10 to 13, which is in the range of% by weight. 15. A method of using the polymer composition according to any one of claims 1 to 9 in a packaging material intended for packaging articles requiring a low water vapor transmission rate and low gas and flavor permeability.